package com.zhuinden.simplestackdemoexamplemvp.util


import android.view.View
import android.view.ViewTreeObserver

/*
 * Copyright 2013 Square Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

typealias OnMeasuredCallback = (view: View, width: Int, height: Int) -> Unit

inline fun View.waitForMeasure(crossinline callback: OnMeasuredCallback) {
    val view = this

    val width = view.width
    val height = view.height

    if (width > 0 && height > 0) {
        callback(view, width, height)
        return
    }

    view.viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
        override fun onPreDraw(): Boolean {
            val observer = view.viewTreeObserver
            if (observer.isAlive) {
                observer.removeOnPreDrawListener(this)
            }

            callback(view, view.width, view.height)

            return true
        }
    })
}